﻿#region License
/******************************************************************************
* Copyright 2018-2020 The AutoCore Authors. All Rights Reserved.
* 
* Licensed under the GNU Lesser General Public License, Version 3.0 (the "License"); 
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* 
* https://www.gnu.org/licenses/lgpl-3.0.html
* 
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*****************************************************************************/
#endregion

using UnityEngine;

namespace Packages.MapToolbox
{
    class Singleton<T> : MonoBehaviour where T : Singleton<T>
    {
        static T instance;
        public static T Instance
        {
            get
            {
                if (!instance)
                {
                    instance = FindObjectOfType<T>();
                    if (!instance)
                    {
                        instance = new GameObject(typeof(T).Name).AddComponent<T>();
                    }
                }
                return instance;
            }
        }
    }
}